KR101971494B1 - UE preference information transmission method and apparatus - Google Patents

Abstract

The present invention relates to a method and apparatus for transmitting preference information of a terminal, and in accordance with the present invention, a terminal determines a preferred operating state of the terminal according to an application or its resource status, And the base station receives the preference information of the terminal and changes or reconfigures the radio resource control (RRC) -related parameter for the terminal and transmits it to the terminal. Accordingly, the UE can change or reconfigure RRC-related parameters at the UE and perform efficient wireless communication.

Description

[0001] The present invention relates to a UE preference information transmission method and apparatus,

The present invention relates to wireless communication, and more particularly, to a method and apparatus for transmitting preference information of a terminal.

2. Description of the Related Art Due to the development of wireless communication technology, various terminals such as smart phones, tablet PCs (personal computers), and the like that can use various applications without being limited in places are popularized. Accordingly, a variety of applications that have been used on a wired network in the past through a PC or the like are now used in the same way as a wired network on a wireless network rather than a wired network, thereby generating a large amount of traffic. However, in the case of a wireless network such as LTE (Long Term Evolution), since the terminal is designed without sufficiently considering the traffic generation situation due to the use of applications in various terminals, in the terminal performing wireless communication with the base station, Inefficient use of the system.

In addition, in the case of a terminal, it is necessary to operate in consideration of power saving due to a lease situation of a battery or the like, and a terminal may use a discontinuous reception (DRX) method or the like. When the DRX scheme is used, the UE can alternately operate in non-active time and active time. Accordingly, the terminal or the base station may reduce the battery consumption of the terminal according to the type of the application or the traffic (or when there is a need to save the battery of the terminal) by increasing the inactivity time of the DRX scheme . On the other hand, depending on the type of application or traffic, the terminal or the base station may need to maintain the maximum wireless data communication efficiency of the terminal by shortening the inactivity time of the DRX scheme or the like. In addition to the above-described specific situation, there may be a case where setting of wireless communication resources or the like is changed according to the situation of the terminal. That is, the preference degree of the wireless communication resources of the terminal may be different depending on the case. Nevertheless, the preference of the terminal is not considered in the wireless communication between the base station and the terminal.

The present invention also provides a method and apparatus for transmitting terminal preference information in a wireless communication system.

Another aspect of the present invention is to provide a method and apparatus for controlling terminal preference information transmission.

Another aspect of the present invention is to provide a method and apparatus for performing RRC-related parameter reconfiguration based on terminal preference information.

Another aspect of the present invention is to provide a method and apparatus for performing DRX reconfiguration based on terminal preference information.

According to an aspect of the present invention, there is provided a method for supporting preferences of a terminal performed by a terminal. The method includes generating terminal preference information indicating a preferred operating state of the terminal and transmitting the generated terminal preference information to a base station, and including RRC related parameters reconfigured by the base station based on the terminal preference information Receiving an RRC connection reconfiguration message from the base station, and configuring the RRC related parameter in the terminal.

According to another aspect of the present invention, there is provided a method of supporting preferences of the terminal performed by a base station. The method includes receiving terminal preference information indicating a preferred operating state of the terminal from the terminal, reconfiguring a radio resource control (RRC) related parameter based on the terminal preference information, And transmitting an RRC connection reconfiguration message including a radio resource-related parameter to the UE.

According to another aspect of the present invention, there is provided the terminal supporting the terminal's preference. The terminal includes a preference determining unit for determining a preferred operating state of the terminal, a message processing unit for generating terminal preference information indicating a preferred operating state of the terminal, a transmitting unit for transmitting the generated terminal preference information to the base station, A receiver for receiving an RRC connection reconfiguration message including a RRC related parameter reconfigured by the base station from the base station based on terminal preference information; a message processor for configuring the RRC- .

According to another aspect of the present invention, there is provided a base station supporting preference of a terminal. Wherein the base station comprises: a receiving unit for receiving terminal preference information indicating a preferred operating state of the terminal from the terminal; a parameter changing unit for reconfiguring a radio resource control (RRC) related parameter based on the terminal preference information; A message processor for generating an RRC connection reconfiguration message including the reconfigured radio resource-related parameters, and a transmitter for transmitting the generated RRC reconfiguration message to the UE.

According to the present invention, it is possible to inform the base station of information on whether the terminal prefers the setting for reducing battery consumption or the setting for increasing the data transmission efficiency. By configuring or reconfiguring RRC parameters based on the terminal preference information, the terminal can perform an operation according to its own preference. Also, the base station can reduce the signaling congestion of the network by allowing the terminal to transmit the terminal preference information to the base station only through the allowed terminal through the preference support information, and by adjusting the time interval at which the terminal transmits the terminal preference information.

1 shows a wireless communication system to which the present invention is applied.
2 is a flowchart illustrating a method of supporting preferences of a terminal according to an exemplary embodiment of the present invention.
3 is a conceptual diagram illustrating a DRX-related parameter and a DRX operation that are reconstructed based on terminal preference information according to an exemplary embodiment of the present invention.
4 is a flowchart illustrating a method of supporting preferences of a terminal according to another exemplary embodiment of the present invention.
5 is a flowchart illustrating a method of supporting preferences of a terminal according to another exemplary embodiment of the present invention.
6 is a flowchart illustrating a method of supporting preferences of a terminal according to another exemplary embodiment of the present invention.
7 is a flowchart showing an example of an operation in which terminal preference information is transmitted through an RRC connection establishment process.
8 is a flowchart illustrating another example of an operation in which terminal preference information is transmitted through an RRC connection establishment process.
9 is a flowchart illustrating another example of an operation in which terminal preference information is transmitted through an RRC connection establishment process.
10 is an operation flowchart of a terminal supporting preference of a terminal according to an exemplary embodiment of the present invention.
11 is an operation flowchart of a base station supporting preference of a terminal according to an exemplary embodiment of the present invention.
12 is a block diagram of a terminal supporting a terminal's preference and a base station according to an exemplary embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known configurations or functions will be omitted if it is determined that the gist of the present specification may be obscured.

In addition, the present invention will be described with respect to a wireless communication network. The work performed in the wireless communication network may be performed in a process of controlling a network and transmitting data by a system (e.g., a base station) Work can be done at a terminal connected to the network.

1 shows a wireless communication system to which the present invention is applied.

Referring to FIG. 1, a wireless communication system 10 is widely deployed to provide various communication services such as voice, packet data, and the like. The wireless communication system 10 includes at least one base station 11 (BS). Each base station 11 provides communication services to specific cells (15a, 15b, 15c). The cell may again be divided into multiple regions (referred to as sectors). The base station 11 may be called by other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, a femto base station, a home node B, . Cells are meant to cover various coverage areas such as megacell, macrocell, microcell, picocell, and femtocell.

A user equipment (UE) 12 may be fixed or mobile and may be a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, (personal digital assistant), a wireless modem, a handheld device, and the like.

Hereinafter, the downlink refers to a transmission link from the base station 11 to the terminal 12, and the uplink refers to a transmission link from the terminal 12 to the base station 11 it means. In the downlink, the transmitter may be part of the base station 11, and the receiver may be part of the terminal 12. In the uplink, the transmitter may be part of the terminal 12, and the receiver may be part of the base station 11. There are no restrictions on multiple access schemes applied to wireless communication systems. (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier-FDMA , OFDM-CDMA, and the like. A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

2 is a flowchart illustrating a method of supporting preferences of a terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the UE transmits UE preference information to a BS (S200). The UE preference information may be transmitted to the base station through a UE preference indication message. The terminal preference information is information indicating a preferred operation state of the terminal. That is, the terminal determines the preferred operating state of the terminal, and generates the terminal preference information indicating the preferred operating state of the terminal and transmits the generated terminal preference information to the base station. Here, the terminal preference information may be, for example, information indicating a state of one of a default state, a low power consumption state, a transmission efficient state, and a traffic adaptive state. have.

First, the terminal preference information may be information indicating the default state. The basic state refers to a state in which the terminal operates in accordance with communication settings such as radio resources, power consumption, DRX state, and the like, which are basically configured in the network without any particular preference. In the basic state, the base station can maintain the current communication configuration without special consideration of the characteristics of traffic and the like. In other words, in the basic state, the terminal has no particular preferred communication configuration, and the base station uses the basic communication configuration.

Second, the terminal preference information may be information indicating the low power consumption state. The battery power saving state is a state in which the terminal operates while reducing battery consumption, and the terminal requires a related configuration so as to reduce battery consumption. In this case, the base station can reconstruct the related configuration so that the terminal can reduce battery consumption based on the information on the battery power saving state.

Third, the terminal preference information may be information indicating the transmission efficiency state. Unlike the battery power saving state, the transmission efficiency state is a state in which the terminal requests a configuration related to the transmission efficiency, which is related to the transmission efficiency, even if the battery consumption increases to some extent.

Fourth, the terminal preference information may be information indicating the traffic adaptive state. The traffic adaptation state may be a state requiring the base station to consider an application and / or a traffic situation currently used. For example, the traffic adaptation state may indicate a state in which the terminal can tolerate a delay of a predetermined time or longer according to an application, a traffic characteristic, or a specific situation. The traffic adaptive state may be referred to as a traffic sensitive state or a traffic selective state.

In addition, a preferred operation state of the terminal indicated by the terminal preference information may include a step or a level as well as a type of the operation state preferred by the terminal. For example, a preferred operating state of the terminal may indicate any one of level 1 to level 3 depending on its strength or necessity in indicating the battery power saving state. The same is true for other operating states as well as battery power saving states.

The preferred operation state of the terminal indicated by the terminal preference information may be up or down (down) or down (down) of a specific item (e.g., power, transmission rate) ). For example, when the preferred operating state of the terminal indicated by the terminal preference information indicates an upward direction of the power item, it is possible to reduce the transmission (reception) efficiency The mobile station may request the base station to focus more on the performance of the mobile station. In this case, it may be the same as the transmission efficiency state. As another example, when the preferred operating state of the terminal indicated by the terminal preference information indicates a downward direction of the power item, it may be a state requiring a related configuration so as to reduce battery consumption, have. This case may be the same as the battery power saving state. As another example, when the preferred operation state of the terminal indicated by the terminal preference information indicates an upward direction of the transmission rate item, it is required that, in contrast to the radio resource configuration configured in the terminal, Lt; / RTI > In this case, it may be the same as the transmission efficiency state. As another example, when the preferred operating state of the terminal indicated by the terminal preference information indicates a downward direction of the transmission rate item, this reduces the transmission (reception) efficiency while reducing battery consumption, etc., It may be a state requiring a related configuration. This case may be the same as the battery power saving state.

Of course, the name and function of the operating state preferred by the terminal indicated by the terminal preference information described above may be set differently according to an appointment between the terminal and the base station, for example.

In step S200, the terminal preference information transmitted from the terminal to the base station may include information on a preferred operation state of the active terminal among various operational states, for example, the default state, the low power consumption state, a transmission efficient state, and a traffic adaptive state, or it may be information that toggles from one state to another state of the plurality of states. have.

For example, the terminal preference information may be information that toggles from the default state to the battery power saving state, or from the battery power saving state to the basic state. The terminal preference information may be information for toggling from the transmission efficiency state to the battery power saving state or from the battery power saving state to the transmission efficiency state. The terminal preference information may also be information that toggles from the basic state to the traffic adaptation state or from the traffic adaptation state to the basic state.

In this case, the terminal preference information may be at least one bit. For example, the terminal preference information is 1 bit, and based on the 1 bit "0" or "1" value, the terminal can inform the base station whether it is in the basic state or the battery power saving state. As another example, the terminal preference information is 1 bit, and based on the 1 bit "0" or "1" value, the terminal can inform the base station whether the battery is in the battery saving state or the transmission efficiency state. As another example, the terminal preference information is 1 bit, and the terminal can inform the base station whether the transmission efficiency state or the traffic adaptation state is based on the 1 bit value of "0" or "1". As another example, the terminal preference information is 1 bit, and based on the 1 bit "0" or "1" value, the terminal can inform the base station whether it is the traffic adaptation state or the basic state. As another example, the terminal preference information is 1 bit, and based on the 1 bit "0" or "1" value, the terminal can inform the base station whether the battery is in the battery saving state or the traffic adaptation state. As another example, the terminal preference information is 1 bit, and based on the 1 bit "0" or "1" value, the terminal can inform the base station whether it is the traffic adaptation state or the basic state. As another example, the terminal preference information is 1 bit, and the terminal can inform the base station whether the base station is in the basic state or in the transmission efficiency based on the 1 bit value of "0" or "1".

As another example, the terminal preference information is 2 bits, and based on the 2 bits of "00", "01", "10", or "11" , The battery saving state, the transmission efficiency state, and the traffic adaptation state. For example, the value " 00 " may represent a basic state, the value " 01 " may indicate a battery power saving state, the value 10 may indicate a transmission efficiency state, and the value 11 may indicate a traffic adaptation state. Of course, the matching of the states according to the bit values is only an example, and may be varied according to the mutual setting of the terminal and the base station, and may also represent various states of the terminal based on bit values of two or more bits.

The base station changes or reconfigures RRC-related parameters based on the terminal preference information. Modification or reconfiguration of RRC-related parameters includes radio resource configuration or radio resource reconfiguration. For example, the RRC-related parameters affected by the UE preference information may include DRX-related parameters.

Here, DRX refers to a function that allows a UE to stop monitoring a physical downlink control channel (PDCCH) for a predetermined period (i.e., non-active time) The DRX mode repeats the active time and the non-active time with a constant periodicity. The activity means that the UE monitors the PDCCH. Inactivity means that the terminal stops monitoring the PDCCH.

The DRX may be configured by radio resource control / media access control (RRC / MAC). Related DRX parameters may include a long DRX cycle, a DRX inactivity timer, and a DRX retransmission timer. Also optionally, DRX includes a short DRX cycle and a DRX short cycle timer (drxShortCycleTimer). The long DRX cycle provides a longer inactivity time for the terminal than the short DRX cycle.

3 is a conceptual diagram illustrating a DRX-related parameter and a DRX operation that are reconstructed based on terminal preference information according to an exemplary embodiment of the present invention.

Referring to FIG. 3, a DRX operation is repeated in a DRX cycle 300. The DRX cycle 300 is a periodic repetition of an opportunity for DRX 310 and an On Duration 305 Is defined. The DRX cycle 300 of one cycle includes the duration 305 and the opportunity for DRX 310. [ The DRX cycle 300 is, for example, a long DRX cycle that is applied in a range between 10 subframes and 2560 subframes. In another example, a short DRX cycle (a short DRX cycle) applied in the range of 2 subframes to 640 subframes DRX cycle). At this time, the short DRX cycle is applied only while the DRX short cycle timer (drxShortCycleTimer) is operating, and the long DRX cycle is applied in the range outside the DRX short cycle timer. Here, the DRX short-cycle timer is one basic DRX cycle. At this time, the length of the short-term DRX cycle timer may be 1 to 16, for example. Term DRX mode when the terminal is operating in the short-term DRX cycle, or a long-term DRX mode when operating in the long-term DRX cycle.

The RRC layer manages several timers to control the DRX operation. The timer for controlling the DRX operation includes a duration timer (onDurationTimer), a DRX Inactivity Timer (DRX Inactivity Timer), and a DRX Retransmission Timer (DRX Retransmission Timer).

The duration timer is started by the start of the DRX cycle. That is, the start time of the sustain interval timer coincides with the start time of the DRX cycle. The duration timer increases by 1 for every PDCCH subframe. And the duration timer expires when the duration timer value equals a preconfigured expiration value. The sustain interval timer is valid until the sustain interval timer value becomes equal to the expiration value.

The DRX inactivity timer may be defined as the number of consecutive PDCCH subframes from the point in time at which the PDCCH for uplink or downlink user data transmission is successfully decoded. It is time for the UE to continuously monitor the PDCCH since continuous data reception may occur. The DRX inactivity timer is started or restarted when the UE successfully decodes the PDCCH for the HARQ initial transmission in the PDCCH subframe.

The DRX Retransmission Timer is a timer that operates based on the maximum number of consecutive numbers of PDCCH subframes expected to be DL retransmitted by the UE. The DRX retransmission timer is a timer that is started when the HARQ RTT timer has expired but fails to receive the retransmission data. The UE can monitor reception of data retransmitted in the HARQ process while the DRX retransmission timer is in progress. The configuration of the DRX Retransmission Timer is defined by the MAC-MainConfig message of the RRC layer.

The duration of the duration timer, DRX inactivity timer, or DRX retransmission timer is referred to as active time. Or the activity time may refer to all the intervals that the terminal is awake. The non-activity time in the DRX cycle 300 may be referred to as a non-active time. The activity time may be referred to as a wake up period, and the inactivity time may be referred to as a sleep period. The terminal monitors the PDCCH for the PDCCH subframe (PDCCH subframe) during the active time. Here, the PDCCH subframe means a subframe including a PDCCH. For example, in a TDD configuration, downlink subframes and downlink pilot time slot (DwPTS) subframes correspond to a PDCCH subframe. A timer unit of a DRX timer such as a duration timer, a DRX inactivity timer, or a DRX retransmission timer is a PDCCH subframe (psf). That is, the DRX timers are counted based on the number of PDCCH subframes.

In addition, there are a long DRX cycle (longDRX-Cycle) and a DRX start offset (drxStartOffset) as parameters for controlling the DRX operation. The base station optionally sets a DRX short cycle timer (drxShortCycleTimer) and a short DRX- . In addition, a HARQ round trip time (RTT) timer is defined for each downlink HARQ process.

The DRX start offset is a value that defines the subframe at which the DRX cycle 300 begins. The DRX short cycle timer is a timer that defines the number of consecutive subframes for which the UE must follow a short DRX cycle. The HARQ RTT timer is a timer that defines the minimum number of subframes prior to an interval in which a UE is expected to receive a downlink HARQ retransmission.

Referring back to FIG. 2, the base station reconfigures an RRC-related parameter, particularly a DRX-related parameter, based on the terminal preference information, and transmits an RRC connection reconfiguration message including the reconfigured message to the terminal in step S210. Modification or reconfiguration of RRC-related parameters includes radio resource configuration or radio resource reconfiguration.

First, when the received terminal preference information indicates the basic state, the base station maintains the RRC-related parameters that were previously configured. Therefore, in this case, S210 may be omitted. Or the base station reconfigures the RRC related parameters with the radio resource (RRC) related parameters that the base station has assigned at the time of the first RRC connection.

Secondly, when the received terminal preference information indicates the battery power saving state, the base station performs RRC-related parameter reconfiguration in a configuration in which battery consumption of the terminal can be reduced.

For example, the base station may reconfigure or reconfigure DRX to operate in a long DRX mode when receiving the terminal preference information for the battery power save state. Or reconfigure DRX so that the terminal's non-active time is kept longer.

For example, when the terminal is in the battery power saving state, the base station can perform DRX reconfiguration such that the terminal does not operate in the short term DRX mode but operates in the long term DRX mode. That is, when both the short-term DRX and the long-term DRX are configured in the DRX setting, and the base station receives the terminal preference information indicating the battery power saving state from the terminal, the base station can remove the short-term DRX configuration.

As another example, when the UE is in the battery power save state, the base station sets the number of subframes n applied to one cycle of the long DRX or short DRX to a predetermined number x or more (n? X or n> x: The number of subframes, and x is the number of subframes equal to or greater than a certain size). In addition, the base station may reconfigure the duration timer to a predetermined time (y) or less (onDurationTimer? Y or onDurationTimer <y). In addition, the base station may reconfigure the DRX inactivity timer and the DRX retransmission timer to a predetermined time or less. Here, if the number of subframes applied in one DRX cycle increases, the cycle of monitoring the PDCCH by the UE becomes longer, so that power consumption of the UE can be reduced. Also, since the duration timer, the DRX inactivity timer, and the DRX retransmission timer are related to the number of PDCCH subframes received, when the time is reconfigured to a shorter time, the power saving of the UE is effective. . The reconstructed DRX configuration information in the above manner can be configured as shown in the following table.

DRX-Config :: = CHOICE {
release NULL,
setup SEQUENCE {
onDurationTimer ENUMERATED {
pSF1, pSF2, pSF3, pSF4, pSF5, pSF6,
psf8, psf10, psf20, psf30, psf40,
psf50, psf60, psf80, psf100, psf200},
DRx-InactivityTimer ENUMERATED {
pSF1, pSF2, pSF3, pSF4, pSF5, pSF6,
psf8, psf10, psf20, psf30, psf40,
psf50, psf60, psf80, psf100,
psf200, psf300, psf500, psf750,
psf1280, psf1920, psf2560, psf0-v1020,
spare9, spare8, spare7, spare6,
spare5, spare4, spare3, spare2,
spare1},
DRx-RetransmissionTimer ENUMERATED {
psf1, psf2, psf4, psf6, psf8, psf16,
psf24, psf33},
longDRX-CycleStartOffset CHOICE {
sf10 INTEGER (0..9),
sf20 INTEGER (0..19),
sf32 INTEGER (0..31),
sf40 INTEGER (0..39),
sf64 INTEGER (0..63),
sf80 INTEGER (0..79),
sf128 INTEGER (0..127),
sf160 INTEGER (0..159),
sf256 INTEGER (0..255),
sf320 INTEGER (0..319),
sf512 INTEGER (0..511),
sf640 INTEGER (0..639),
sf1024 INTEGER (0..1023),
sf1280 INTEGER (0..1279),
sf2048 INTEGER (0..2047),
sf2560 INTEGER (0..2559)
},
shortDRX SEQUENCE {
shortDRX-Cycle ENUMERATED {
sf2, sf5, sf8, sf10, sf16, sf20,
sf32, sf40, sf64, sf80, sf128, sf160,
sf256, sf320, sf512, sf640},
drxShortCycleTimer INTEGER (1..16)
} OPTIONAL - Need OR
}
}

Referring to Table 1, the DRX configuration information includes an onDurationTimer field for defining a value of a duration timer, a drx-InactivityTimer field indicating a value of the DRX inactivity timer, and a drx-RetransmissionTimer field indicating a value of the DRX retransmission timer do. The DRX configuration information also includes a longDRX-CycleStartOffset field indicating the length of the long DRX cycle and a starting subframe, and a shortDRX field related to the short-term DRX that can be optionally configured. The shortDRX field specifically includes a shortDRX-Cycle subfield that indicates the length of the short DRX cycle and a drxShortCycleTimer subfield that indicates the value of the short-term DRX cycle timer that the terminal consecutive.

The onDurationTimer field may be set to any one of the values of {psf1, psf2, psf3, ... psf200}. psf denotes a PDCCH subframe, and the number after psf denotes the number of PDCCH subframes. That is, psf represents the expiration value of the timer as the number of PDCCH subframes. For example, if the onDurationTimer field = psf1, the duration timer expires after progressing cumulatively to one PDCCH subframe including the subframe where the DRX cycle started. Or the onDurationTimer field = psf4, the duration timer expires after progressing from the beginning of the DRX cycle cumulatively to the four PDCCH subframes. The drx-InactivityTimer field may be set to any one of the values of {psf1, psf2, psf3, ... psf2560}. For example, if the drx-InactivityTimer field = psf3, the DRX inactivity timer expires after progressing up to three PDCCH subframes cumulatively, including the subframe at the time of driving. The drx-RetransmissionTimer field may be set to one of the values of {psf1, psf2, psf4, ... psf33}. For example, if the drx-RetransmissionTimer field = psf4, the DRX Retransmission Timer expires after progressing up to four PDCCH subframes cumulatively including the subframe at the time of being driven.

The longDRX-CycleStartOffset field may be set to one of the values of {sf10, sf20, sf32, sf40, ... sf2560} as the length of the long DRX cycle, and the subframe at which the long DRX cycle starts is the length of the long DRX cycle INTEGER (0..39), ... INTEGER (0..2559)} values corresponding to the values of the values of [ For example, if the longDRX-CycleStartOffset field = sf20, INTEGER (0..19), one long DRX cycle includes 20 subframes, and the long DRX cycle may be any subframe Can be selected as the long-term DRX cycle start sub-frame. The shortDRX-Cycle subfield constituting the shortDRX field may be set to any one of the values of {sf2, sf5, sf8, ... sf640}. For example, if the shortDRX-Cycle subfield = sf5, then one short DRX cycle includes five subframes. In addition, the drxShortCycleTimer subfield constituting the shortDRX field may represent any one of the integers 1 to 16. For example, if the drxShortCycleTimer subfield = 3, the short DRX cycle expires three times.

In a case where the onDurationTimer field = psf10 and the longDRX-CycleStartOffset field = sf40 and INTEGER (0..39), for example, the base station transmits the terminal preference information (UE Preference Information) If it is found that the battery is in low power consumption, the base station may reconfigure to the onDurationTimer field = psf8. The base station can also be reconfigured with the longDRX-CycleStartOffset field = sf64, INTEGER (0..63). The base station may also reconfigure the onDurationTimer field = psf8 and the longDRX-CycleStartOffset field = sf64, INTEGER (0..63) at the same time. In the case of the above method, the UE can operate more intermittently at the active time due to the increase of the DRX cycle length, and the UE can operate at the active time for a shorter time due to the decrease of the duration timer , The terminal can reduce power consumption.

Thirdly, when the received terminal preference information indicates the transmission efficiency state, the base station performs the RRC-related parameter reconfiguration in a direction to increase the transmission efficiency. For example, when the BS receives the UE preference information for the transmission efficiency state, the BS may configure the DRX cycle to be shorter in order to increase the DL transmission efficiency, The non-active time may be made shorter.

For example, when only a long-term DRX is configured in the terminal and the short-term DRX is not configured, and the base station receives the terminal preference information indicating the transmission efficiency state from the terminal, the base station further configures a short-term DRX .

As another example, when the terminal is in the transmission efficiency state, that is, when the base station receives the terminal preference information indicating the transmission efficiency state from the terminal, the base station calculates the number of subframes applied to one cycle of the long- n) can be reconstructed to a certain number (x) or less (where n? x or n < x: n is the number of DRX subframes and x is a predetermined number of subframes or more). Further, the base station may reconfigure the duration timer to a predetermined time or more (onDurationTimer? Y or onDurationTimer> y). In addition, the base station may reconfigure the DRX inactivity timer and the DRX retransmission timer, for example, over a certain period of time. In this case, the active time for the UE to monitor the PDCCH subframe occurs more frequently, becomes longer, and the downlink transmission efficiency can be improved.

Specifically, for example, when the onDurationTimer field = psf10 and the longDRX-CycleStartOffset field = sf40 and INTEGER (0..39), the base station transmits the terminal preference information (UE Preference Information) If it is found that it is in a transmission efficiency state, the base station can reconstruct the onDurationTimer field = psf20. The base station can also be reconfigured with the longDRX-CycleStartOffset field = sf32, INTEGER (0..31). The base station may also reconfigure the onDurationTimer field = psf20 and the longDRX-CycleStartOffset field = sf32, INTEGER (0..31) at the same time. In the case of the above method, since the DRX cycle length is reduced, the UE can operate more frequently at the active time, and the UE can operate for a longer period of time due to an increase in the duration timer , The transmission efficiency can be improved.

Fourth, when the received terminal preference information indicates the traffic adaptive state, the base station performs the RRC-related parameter reconfiguration in consideration of an application and / or a traffic situation currently used by the terminal. When the base station receives the terminal preference information indicating the traffic adaptation state from the terminal, the base station confirms that the terminal is in the traffic adaptation state, and determines whether the application currently used by the terminal, the traffic state of the terminal, (E.g., QCI (Quality of Service Identifier), etc.) assigned to the radio resource configuration (e.g., the radio resource configuration) have. Alternatively, the base station may transmit a plurality of available radio resource configurations to the terminal, and the terminal may select a desired configuration within the radio resource configuration transmitted by the base station. Alternatively, the terminal may add information on an allowable delay level or the like to the terminal preference information including information on the traffic adaptation state, or may separately transmit the information to the base station. In this case, the base station confirms that the UE is in the traffic adaptation state based on the UE preference information, and performs radio resource configuration or reconfiguration based on the allowable delay level information. In other words, the BS can perform DRX configuration, QoS level configuration (or QCI configuration), scheduling timing, or the like in consideration of an allowable delay time and the like, and transmit the configuration to the UE.

For example, when the base station receives the terminal preference information including information on the traffic adaptation state from the terminal, the base station can recognize that the terminal is in the traffic adaptation state. Also, the base station can know the radio bearer in use by the terminal, the QoS level (e.g., QCI, etc.), the traffic characteristics, and the like. Therefore, based on this, the base station can differentiate the DRX configuration corresponding to the radio bearers.

For example, a QoS Class Identifier (QCI) table can be configured as shown in the following table.

Referring to Table 2, a packet delay budget is an upper bound of an allowable delay time in the UE, a PELR is a packet error loss rate, a GBR is a guaranteed bit rate rate.

Traffic can be transmitted through a plurality of radio bearers between the base station and the terminals, and the plurality of radio bearers can have different QCI values. For example, assume that one of the two radio bearers configured for traffic transmission has a QCI 3 value and the other radio bearer has a QCI 6 value. Generally, the base station can transmit traffic to the UE through a single DRX configuration even in such a situation. However, if the BS confirms that the UE is in the traffic adaptation state based on the UE preference information, it can generate a plurality of DRX configurations and transmit the DRX configuration to the UE. In this way, the base station enables the terminal to make a selection according to its preference. Specifically, for example, a base station may transmit a DRX configuration 1 adaptively configured to a radio bearer having the QCI 3 value, a DRX configuration 2 adaptively configured to a radio bearer having the QCI 6 value, Configuration, and can transmit the RRC connection reconfiguration message to the UE. In this case, the UE can select either the DRX configuration 1 or the DRX configuration 2 included in the RRC connection reconfiguration message. At this time, the terminal can inform the base station which DRX configuration 1 or DRX configuration 2 is selected.

4 is a flowchart illustrating a method of supporting preferences of a terminal according to another exemplary embodiment of the present invention.

Referring to FIG. 4, the BS transmits preference support information (UE preference information available) to the MS (S400). The preference support information is information indicating whether or not the base station can receive or use the terminal preference information. This is because the BS may or may not perform the RRC-related parameter reconfiguration using the terminal preference information according to the performance thereof. The terminal can determine whether to check (or generate or transmit to the base station) its own preference information according to whether the base station can use the terminal preference information. In other words, the terminal may use the preference support information as a criterion for determining whether to use the terminal preference information.

The preference support information may indicate two things: allowed or not allowed. If the preference support information indicates 'allow', it means that the base station can receive or use the terminal preference information. Or if the preference support information indicates 'allow', this may mean that the base station allows the terminal to transmit the terminal preference information to the base station. In this case, it can be seen that the terminal can transmit the preference information to the base station. On the other hand, if the affinity support information indicates 'not allowed', it means that the base station can not receive or use the terminal preference information. Or if the preference support information indicates 'not allowed', this may mean that the base station does not allow the terminal to transmit the terminal preference information to the base station.

The preference support information may be included in, for example, system information. That is, the base station can transmit the preference support information through a broadcast control channel (BCCH), which is a logical channel. In general, all terminals may not be set to use terminal preference information, and the base station may not know which terminal is using the terminal preference information. Therefore, the base station needs to broadcast preference support information to a plurality of terminals . Accordingly, the preference support information is preferably transmitted to the terminal through the system information. The terminal can know whether the base station can receive the terminal preference information by receiving the preference support information through the system information.

An example of system information including preference support information may be configured as follows.

- ASN1START

SystemInformationBlockType1 :: = SEQUENCE {
cellAccessRelatedInfo SEQUENCE {
plmn-IdentityList PLMN-IdentityList,
trackingAreaCode TrackingAreaCode,
cellIdentity CellIdentity,
cellBarred ENUMERATED {barred, notBarred}
intraFreqReselection ENUMERATED {allowed, notAllowed}
csg-Indication BOOLEAN,
csg-Identity CSG-Identity OPTIONAL - Need OR
},
cellSelectionInfo SEQUENCE {
q-RxLevMin Q-RxLevMin,
q-RxLevMinOffset INTEGER (1..8) OPTIONAL - Need OP},
p-Max P-Max OPTIONAL, - Need OP
freqBandIndicator INTEGER (1..64),
schedulingInfoList SchedulingInfoList,
tdd-Config TDD-Config OPTIONAL, - Cond TDD
si-WindowLength ENUMERATED {
ms1, ms2, ms5, ms10, ms15, ms20,
ms40},
systemInfoValueTag INTEGER (0..31),
uePreferInfoAvail ENUMERATED { allowed , notAllowed }
nonCriticalExtension SystemInformationBlockType1-v890-IEs OPTIONAL
}
...

Referring to Table 3, System Information Block Type 1 includes preference support information (uePreferInfoAvail). The preference support information (uPreferInfoAvail) indicates allowed or notAllowed.

Another example of the system information including the preference support information may be configured as follows.

- ASN1START

SystemInformationBlockType1 :: = SEQUENCE {
cellAccessRelatedInfo SEQUENCE {
plmn-IdentityList PLMN-IdentityList,
trackingAreaCode TrackingAreaCode,
cellIdentity CellIdentity,
cellBarred ENUMERATED {barred, notBarred}
intraFreqReselection ENUMERATED {allowed, notAllowed}
csg-Indication BOOLEAN,
csg-Identity CSG-Identity OPTIONAL - Need OR
},
cellSelectionInfo SEQUENCE {
q-RxLevMin Q-RxLevMin,
q-RxLevMinOffset INTEGER (1..8) OPTIONAL - Need OP},
p-Max P-Max OPTIONAL, - Need OP
freqBandIndicator INTEGER (1..64),
schedulingInfoList SchedulingInfoList,
tdd-Config TDD-Config OPTIONAL, - Cond TDD
si-WindowLength ENUMERATED {
ms1, ms2, ms5, ms10, ms15, ms20,
ms40},
systemInfoValueTag INTEGER (0..31),
uePreferInfoAvail OPTIONAL
nonCriticalExtension SystemInformationBlockType1-v890-IEs OPTIONAL
}
...

Referring to Table 4, the SystemInformationBlockType1 may optionally include the uePreferInfoAvail field. That is, the uePreferInfoAvail field may be optionally configured in the system information block type 1. In this case, if the preference support information (uePreferInfoAvail) field exists, it indicates that the corresponding base station supports the terminal preference information, and if the preference support information (uePreferInfoAvail) field does not exist, the corresponding base station does not support the terminal preference information .

The base station not only supports preference support information but also various kinds of information that the terminal can transmit, such as assistant information for interference avoidance for in-device coexistence (IDC), heterogeneous network (HetNet) Auxiliary information, or MBMS-related auxiliary information to the mobile station. That is, since the terminal can transmit various assistant information to the base station, the base station can inform the terminal whether the assistant information is supported. The following table is an example of a system information syntax that includes information indicating whether or not to support various auxiliary information that the terminal can transmit.

- ASN1START

SystemInformationBlockType14 :: = SEQUENCE {
idcFreqInfoAvail ENUMERATED {allowed, notAllowed}
hetNetInfoAvail ENUMERATED {allowed, notAllowed}
uePreferinfoAvail ENUMERATED { allowed , notAllowed }
MBMSInfoAvail ENUMERATED {allowed, notAllowed}
lateNonCriticalExtension OCTET STRING OPTIONAL - Need OP
}

- ASN1STOP

Referring to Table 5, information indicating whether or not to support various kinds of auxiliary information that the terminal can transmit may be included in the system information block type 14. Here, the idcFreqinfoAvail field indicates whether the base station supports IDC-related auxiliary information. The hetNetInfoAvail field indicates whether the base station supports HetNet related ancillary information. The uePreferinfoAvail field indicates whether the base station supports supplementary information about terminal preferences. The MBMSInfoAvail field indicates whether the base station supports MBMS-related assistance information. If the value of each information field is 'allowed', it indicates that the base station supports the corresponding auxiliary information. If the value is 'notAllowed', it indicates that the base station does not support the corresponding auxiliary information. On the other hand, the idcFreqinfoAvail field, the hetNetInfoAvail field, the uePreferinfoAvail field, and the MBMSInfoAvail field may be optional, as the uePreferInfoAvail field is optional in Table 4. That is, the idcFreqinfoAvail field, the hetNetInfoAvail field, the uePreferinfoAvail field, and the MBMSInfoAvail field may be optionally configured in the system information block type 14. In this case, if the idcFreqinfoAvail field exists, it indicates that the corresponding base station supports the IDC related auxiliary information, and if the idcFreqinfoAvail field does not exist, it indicates that the corresponding base station does not support the IDC related auxiliary information. In addition, if the hetNetInfoAvail field exists, it indicates that the corresponding base station supports HetNet related auxiliary information, and if the hetNetInfoAvail field does not exist, it indicates that the corresponding base station does not support HetNet related auxiliary information. In addition, if the uePreferinfoAvail field exists, it indicates that the corresponding base station supports supplementary information about the terminal preference, and if the uePrefinfoAvail field does not exist, it indicates that the corresponding base station does not support the supplementary information about the terminal preference. Also, if the MBMSInfoAvail field exists, it indicates that the corresponding base station supports MBMS related auxiliary information, and if the MBMSInfoAvail field does not exist, it indicates that the corresponding base station does not support the MBMS related auxiliary information.

In the system information, the auxiliary information may be configured in the form of a bitmap or a bit string as shown in the following table.

- ASN1START

SystemInformationBlockType14 :: = SEQUENCE {
ueAssistantInfoAvail BIT STRING ( SIZE (X)) ,
lateNonCriticalExtension OCTET STRING OPTIONAL - Need OP
}

- ASN1STOP

Referring to Table 6, the ueAssistantInfoAvail field is a bit-string format that can indicate whether or not various kinds of auxiliary information are supported. In SIZE (X), X is the bit length of the ueAssistantInfoAvail field, which may be equal to the number of auxiliary information supported by the base station. For example, if three auxiliary information such as idcFreqInfo, hetNetInfo, and uePreferInfo can be supported, then X = 3 and the number of bits in the ueAssistantInfoAvail field is 3. Each bit corresponds to each piece of auxiliary information sequentially. If the bit of the ueAssistantInfoAvail field is abc, the bit a corresponds to idcFreqInfo, the bit b corresponds to hetNetInfo, and the bit c corresponds to uePreferInfo. If the value of the bit is 0, it indicates that the corresponding auxiliary information is not supported by the base station, and if the value of the bit is 1, it indicates that the corresponding auxiliary information is supported by the base station. For example, if the ueAssistantInfoAvail field is equal to 001, the base station does not support idcFreqInfo, hetNetInfo, and uePerferInfo.

Upon receiving the system information including the preference support information or the information indicating whether the assistance information is supported from the base station, the terminal checks whether the preference support information or the assistance information is supported or not. If the preference support information indicates 'not allowed', the terminal does not transmit the terminal preference information to the base station. On the other hand, if the affinity support information indicates 'allow', the terminal transmits the terminal preference information to the base station (S410). That is, the terminal may transmit the terminal preference information to the base station adaptively according to the content of the preference information at the base station. The base station reconfigures RRC related parameters based on the terminal preference information, and transmits an RRC connection reconfiguration message including the reconfigured RRC related parameters to the terminal in step S420. The transmission of the terminal preference information, and the transmission of the RRC connection reconfiguration message may be performed in the same manner as the operations of steps S200 and S210, respectively.

5 is a flowchart illustrating a method of supporting preferences of a terminal according to another exemplary embodiment of the present invention.

Referring to FIG. 5, the base station transmits a UE Preference inquiry or UE Preference Capability Request to the UE (S500). The terminal preference inquiry information is information that the base station inquires of the terminal whether the terminal can transmit (or support) the terminal preference information. At this time, the BS may inquire about the overall information on the overall performance of the UE as well as inquire as to whether the UE supports the transmission of the UE preference information. The UE transmits UE Preference Capability information to the BS according to the UE preference inquiry information received from the BS in step S510. The terminal preference performance information is information indicating whether the terminal can transmit (or support) the terminal preference information. The UE and the BS can use the UE capability inquiry procedure to exchange the UE preference inquiry information and the UE preference performance information. In this case, the terminal preference inquiry information may be included in the terminal capability inquiry message (UECapabilityEquiry Message) in step S500. In step S510, the terminal preference performance information may be transmitted in the terminal capability information (UECapabilityInformation). Specifically, the terminal capability information may be configured as shown in the following table.

- ASN1START

UECapabilityInformation :: = SEQUENCE {
rrc-TransactionIdentifier RRC-TransactionIdentifier,
criticalExtensions CHOICE {
c1 CHOICE {
ueCapabilityInformation-r8 UECapabilityInformation-r8-IEs,
spare7 NULL,
spare6 NULL, spare5 NULL, spare4 NULL,
spare3 NULL, spare2 NULL, spare1 NULL
},
criticalExtensionsFuture SEQUENCE {}
}
}

UECapabilityInformation-r8-IEs :: = SEQUENCE {
ue-CapabilityRAT-ContainerList UE-CapabilityRAT-ContainerList,
nonCriticalExtension SEQUENCE {} OPTIONAL
}

- ASN1STOP

Referring to Table 7, the UE capability information (UECapabilityInformation) may include IE UE-EUTRA-Capability information in a container of the ue-CapabilityRat-ContainerList field, and UE preference performance information may be included in the IE UE- Capability information can be included. Specifically, IE UE-EUTRA-Capability information can be configured in the following table.

- ASN1START

UE-EUTRA-Capability :: = SEQUENCE {
accessStratumRelease AccessStratumRelease,
ue-Category INTEGER (1..5),
pdcp-Parameters PDCP-Parameters,
phyLayerParameters PhyLayerParameters,
rf-Parameters RF-Parameters,
measParameters MeasParameters,
featureGroupIndicators BIT STRING (SIZE (32)) OPTIONAL,
interRAT-Parameters SEQUENCE {
utraFDD IRAT-ParametersUTRA-FDD OPTIONAL,
utraTDD128 IRAT-ParametersUTRA-TDD128 OPTIONAL,
utraTDD384 IRAT-ParametersUTRA-TDD384 OPTIONAL,
utraTDD768 IRAT-ParametersUTRA-TDD768 OPTIONAL,
geran IRAT-ParametersGERAN OPTIONAL,
cdma2000-HRPD IRAT-Parameters CDMA2000-HRPD OPTIONAL,
cdma2000-1xRTT IRAT-Parameters CDMA2000-1XRTT OPTIONAL
},
nonCriticalExtension UE-EUTRA-Capability-v920-IEs OPTIONAL
}

UE-EUTRA-Capability-v11xx-IEs :: = SEQUENCE {
ueAssistantCapaInfo BIT STRING ( SIZE (X)) ,
nonCriticalExtension SEQUENCE {} OPTIONAL
}
...

Referring to Table 8, the UE-EUTRA-Capability-v11xx-IEs field is information on a new terminal capability, and includes a terminal auxiliary performance information field (ueAssistantCapaInfo). The Auxiliary Performance Information field of the terminal is a field indicating auxiliary information that the terminal can support (transmit). The auxiliary performance information field of the UE includes auxiliary information idcFreqInfo for intra-device coexistence interference avoidance (IDC), auxiliary information related to heterogeneous network (hetNetInfo), MBMS related auxiliary information (MBMSInfo) and auxiliary information (uePreferInfo) It is possible to display the support or capability of the terminal with respect to at least one piece of information. The Auxiliary capability information field of the terminal may have a bit string or a bitmap shape and may have a length X corresponding to the number of auxiliary information supported by the terminal.

For example, if four auxiliary information such as idcFreqInfo, hetNetInfo, uePreferInfo, and MBMSInfo can be supported, X of ueAssistantCapaInfo is 4 and the number of bits of the ueAssistantCapaInfo field is 4. Each bit corresponds to each piece of auxiliary information sequentially. If the bit in the ueAssistantCapaInfo field is abcd, the bit a corresponds to idcFreqInfo, the bit b corresponds to hetNetInfo, the bit c corresponds to uePreferInfo, and the bit d corresponds to MBMSInfo. If the value of the bit is 0, it indicates that the corresponding auxiliary information is not supported by the terminal, and if the value of the bit is 1, it indicates that the corresponding auxiliary information is supported by the terminal. For example, if the ueAssistantCapaInfo field is equal to 0010, the terminal does not support idcFreqInfo, hetNetInfo, and MBMSInfo, and uePreferInfo is supported.

Alternatively, the IE UE-EUTRA-Capability information may be configured as shown in the following table.

- ASN1START

UE-EUTRA-Capability :: = SEQUENCE {
accessStratumRelease AccessStratumRelease,
ue-Category INTEGER (1..5),
pdcp-Parameters PDCP-Parameters,
phyLayerParameters PhyLayerParameters,
rf-Parameters RF-Parameters,
measParameters MeasParameters,
featureGroupIndicators BIT STRING (SIZE (32)) OPTIONAL,
interRAT-Parameters SEQUENCE {
utraFDD IRAT-ParametersUTRA-FDD OPTIONAL,
utraTDD128 IRAT-ParametersUTRA-TDD128 OPTIONAL,
utraTDD384 IRAT-ParametersUTRA-TDD384 OPTIONAL,
utraTDD768 IRAT-ParametersUTRA-TDD768 OPTIONAL,
geran IRAT-ParametersGERAN OPTIONAL,
cdma2000-HRPD IRAT-Parameters CDMA2000-HRPD OPTIONAL,
cdma2000-1xRTT IRAT-Parameters CDMA2000-1XRTT OPTIONAL
},
nonCriticalExtension UE-EUTRA-Capability-v920-IEs OPTIONAL
}

UE-EUTRA-Capability-v11xx-IEs :: = SEQUENCE {
uePreferCapaInfo ENUMERATED { support , noSupport } ,
nonCriticalExtension SEQUENCE {} OPTIONAL
}
...

Referring to Table 9, the UE-EUTRA-Capability-v11xx-IEs field may include a capability or a capability field for specific ancillary information other than the UE's ueAssistantInfoCapa field. For example, the UE-EUTRA-Capability-v11xx-IEs field may include the UE's preference performance information (uePreferCapaInfo) field. At this time, the terminal's preference performance information indicates the capability of the terminal as to whether the terminal can support (transmit or generate) the terminal preference information. The terminal's preference performance information can indicate either support or no support. If the terminal's preference performance information indicates 'support,' it means that the terminal supports the terminal preference information. That is, in this case, the BS can know that the MS can transmit the MS preference information to the BS. On the other hand, if the terminal's preference performance information indicates 'no support', it means that the terminal does not support the terminal preference information. That is, in this case, the base station confirms that the terminal can not transmit the terminal preference information to the base station. On the other hand, as shown in Table 4, the uePreferInfoAvail field may be optional, and the UE's preference performance information field may be configured to be optional. That is, the UE's preference performance information (uePreferCapaInfo) field may be optionally configured in the UE-EUTRA-Capability-v11xx-IEs field. In this case, if the UE's preference performance information (uePreferCapaInfo) field exists, it indicates that the corresponding UE supports the UE preference information, and if the UE's preference performance information (uePreferCapaInfo) field does not exist, Is not supported.

Based on the terminal's preference performance information, the base station can distinguish which terminal supports terminal preference information and which terminal does not support terminal preference information. The base station transmits preference support information or ue PreferenceInfoAvail to the terminal supporting the terminal preference information (after further determining the necessity of the terminal preference information according to circumstances) (S520). Thus, the base station can inform the terminal whether it can receive the terminal preference information. Or the base station may allow (or command) the terminal to transmit the terminal preference information to the base station. Or the base station can inform the terminal that it supports or permits transmission of the terminal preference information only to a specific terminal. Since the preference support information can be transmitted specifically to the UE, the preference support information can be transmitted from the base station to the UE through a dedicated control channel (DCCH), which is a logical channel. For example, the preference support information may be transmitted via an RRC connection setup message. This can prevent the base station from unnecessarily receiving the terminal preference information by transmitting terminal preference information at all times. In addition, signaling congestion of the network can be prevented by allowing the terminal to transmit the terminal preference information to the base station only through the terminal that has been permitted through the preference support information.

If the base station permits transmission of the terminal preference information to the terminal according to the content of the preference support information or confirms that the base station can receive the terminal preference information, the terminal transmits the terminal preference information to the base station (S530) In step S540, an RRC-related parameter is reconfigured based on the terminal preference information, and an RRC connection reconfiguration message including the reconfigured RRC related parameter is transmitted to the terminal in step S540. Modification or reconfiguration of RRC-related parameters includes radio resource configuration or radio resource reconfiguration. The transmission of the terminal preference information, and the transmission of the RRC connection reconfiguration message may be performed in the same manner as the operations of steps S200 and S210, respectively.

On the other hand, in step S520, the base station may transmit support information for other assistance information together with preference support information to a terminal dedicatedly. For example, the base station may receive not only the preference support information but also various information that the terminal can transmit, such as auxiliary information for coexistence interference avoidance (IDC) in the device, auxiliary information related to heterogeneous networks, or MBMS- (Or whether the base station permits (or commands) transmission to the terminal). That is, since the terminal can transmit various kinds of auxiliary information to the base station, the base station needs to explicitly inform the terminal about support or permission. The preference support information is equivalent to the support information of the base station with respect to the terminal preference information. The following table is an example of a syntax including support information for assistance information of a terminal transmitted by a base station.

...
idcFreqInfoAvail ENUMERATED {allowed, notAllowed}
hetNetInfoAvail ENUMERATED {allowed, notAllowed}
uePreferenceInfoAvail ENUMERATED {allowed, notAllowed}
MBMSInfoAvail ENUMERATED {allowed, notAllowed}
...

Referring to Table 10, the idcFreqInfoAvail field indicates whether the base station supports IDC-related auxiliary information. The hetNetInfoAvail field indicates whether the base station supports HetNet related ancillary information. The uePreferenceInfoAvail field indicates whether the base station supports supplementary information (i.e., terminal preference information) related to the preference of the terminal. The MBMSInfoAvail field indicates whether the base station supports MBMS-related assistance information. If the value of each information field is 'allowed', it indicates that the base station supports the corresponding auxiliary information. If the value is 'notAllowed', it indicates that the base station does not support the corresponding auxiliary information. Meanwhile, the idcFreqInfoAvail field, the hetNetInfoAvail field, the uePreferenceInfoAvail field, and the MBMSInfoAvail field of the terminal may be optional, as shown in Table 4, in which the uePreferInfoAvail field is configured to be optional. In this case, if the idcFreqinfoAvail field exists, it indicates that the corresponding base station supports the IDC related auxiliary information, and if the idcFreqinfoAvail field does not exist, it indicates that the corresponding base station does not support the IDC related auxiliary information. In addition, if the hetNetInfoAvail field exists, it indicates that the corresponding base station supports HetNet related auxiliary information, and if the hetNetInfoAvail field does not exist, it indicates that the corresponding base station does not support HetNet related auxiliary information. In addition, if the uePreferinfoAvail field exists, it indicates that the corresponding base station supports supplementary information about the terminal preference, and if the uePrefinfoAvail field does not exist, it indicates that the corresponding base station does not support the supplementary information about the terminal preference. Also, if the MBMSInfoAvail field exists, it indicates that the corresponding base station supports MBMS related auxiliary information, and if the MBMSInfoAvail field does not exist, it indicates that the corresponding base station does not support the MBMS related auxiliary information.

Meanwhile, whether or not the preference support information and other assistance information are supported can be configured in the form of a bitmap or a bit string as shown in the following table.

...
ueAssistantInfoAvail BIT STRING (SIZE (X)),
...

Referring to Table 11, the ueAssistantInfoAvail field may indicate whether or not various auxiliary information at the base station is supported as a bit string format. In SIZE (X), X is the bit length of the ueAssistatnInfoAvail field, which may be equal to the number of auxiliary information supported by the base station. For example, X = 4 if the base station can support four auxiliary information such as idcFreqInfo, hetNetInfo, uePreferenceInfo, MBMSInfo, and the number of bits in the ueAssistatnInfoAvail field is 4. Each bit corresponds to each piece of auxiliary information sequentially and indicates whether or not each piece of auxiliary information is supported. Each bit corresponds to each piece of auxiliary information sequentially. If the bit of the ueAssistantInfoAvail field is abcd, the bit a corresponds to idcFreqInfo, the bit b corresponds to hetNetInfo, the bit c corresponds to uePreferInfo, and d corresponds to MBMSInfo. If the value of the bit is 0, it indicates that the corresponding auxiliary information is not supported by the base station, and if the value of the bit is 1, it indicates that the corresponding auxiliary information is supported by the base station. For example, if the ueAssistantInfoAvail field is equal to 0010, the base station does not support idcFreqInfo, hetNetInfo, and MBMSInfo, and uePerferInfo is supported.

On the other hand, in step S520, the preference support information may have a function of instructing the terminal to stop transmitting the terminal preference information currently in progress. For example, the base station defines preference support information as a 1-bit flag. If the flag is set to 1, the base station indicates that the preference information can be received or requests the terminal to transmit the terminal preference information You can tell. On the other hand, if the flag is set to 0, it indicates that the base station can not receive the terminal preference information, or can instruct the terminal not to transmit the terminal preference information.

Meanwhile, in order to prevent the terminal from transmitting the terminal preference information to the base station too frequently, the terminal can operate a minimum time interval (MTI).

6 is a flowchart illustrating a method of supporting preferences of a terminal according to another exemplary embodiment of the present invention. In FIG. 6, terminal preference information is periodically or aperiodically transmitted from a terminal to a base station.

Referring to FIG. 6, the BS transmits preference support information (UE preference information available) to the UE (S600). The preference support information includes a minimum time interval (MTI) for transmitting the terminal preference information (and / or various types of auxiliary information that the terminal can transmit to the base station). The MTI indicates a minimum time for the UE to wait until it transmits the UE preference information to the BS after the UE transmits the UE preference information to the BS. Alternatively, the MTI may indicate a cycle in which the terminal transmits the terminal preference information to the base station. The terminal does not transmit the terminal preference information to the base station again before the time indicated by the MTI. In other words, the MTI can function as a kind of prohibit timer for prohibiting the transmission of terminal's terminal preference information for a certain period of time.

For example, if the MTI is 2 minutes (min), the terminal transmits the terminal preference information to the base station with an interval of at least 2 minutes.

Here, the preference support information including the MTI may be broadcasted from a base station to a mobile station through a Broadcast Control Channel (BCCH) as a logical channel, or may be broadcast by a base station through a dedicated control channel (DCCH) Lt; / RTI &gt;

If the base station permits transmission of the terminal preference information to the terminal according to the content of the preference support information or confirms that the base station can receive the terminal preference information, the terminal transmits the terminal preference information to the base station (S610) In step S620, an RRC-related parameter is reconfigured based on the terminal preference information, and an RRC connection reconfiguration message including the reconfigured RRC-related parameter is transmitted to the terminal in step S620. The transmission of the terminal preference information, and the transmission of the RRC connection reconfiguration message may be performed in the same manner as the operations of steps S200 and S210, respectively. In step S610, after transmitting the UE preference information, the UE drives a UE Preference prohibit timer for prohibiting transmission of UE preference information during the MTI. Accordingly, in this case, the terminal can not transmit the terminal preference information to the base station because the terminal preference information inhibition timer has not expired during the MTI. Alternatively, after transmitting the terminal preference information in step S610, the terminal may prohibit transmission of the next terminal preference information within the MTI period with the MTI period.

Therefore, the terminal does not transmit the terminal preference information during the MTI (S630).

The terminal transmits the terminal preference information to the base station after the elapse of the MTI (after the expiration of the terminal preference prohibition timer or after the lapse of the period) (S640), and the base station reconfigures the RRC related parameters based on the terminal preference information transmitted in S640 And transmits an RRC connection reconfiguration message including the reconfigured RRC related parameters to the UE in operation S650. The transmission of the terminal preference information, and the transmission of the RRC connection reconfiguration message may be performed in the same manner as the operations of steps S200 and S210, respectively.

On the other hand, in step S640, the terminal determines a preferred operation state of the terminal based on the reconfigured RRC-related parameters included in the RRC connection reconfiguration message received in step S620, generates terminal preference information based on the determined operation state, and transmits the terminal preference information to the base station It is possible. Specifically, the terminal may change or reconfigure RRC-related parameters at the terminal end based on the reconfigured RRC-related parameters received from the base station in step S620. This may be referred to as a radio resource configuration or a radio resource reconfiguration, and the UE can determine a preferred operation state of the UE based on the radio resource configuration or the radio resource reconfiguration. For example, if the terminal desires more battery saving based on the radio resource configuration or the reconfiguration of the radio resource, or if more battery saving is required for the terminal, the terminal has a low power consumption state, a higher level (Or step), or a power down state, and the terminal preference information may be generated and transmitted to the base station in step S640. As another example, when the terminal desires higher transmission efficiency based on the radio resource configuration or the radio resource reconfiguration or a higher transmission efficiency is required for the terminal (or terminal battery consumption is allowed), the terminal transmits the transmission efficiency efficient state, a higher level (or step) transmission efficiency state, or a transmission rate up state, and terminal preference information for the terminal preference information may be generated and transmitted to the base station in step S640. In this case, the BS reconstructs the RRC related parameters based on the UE preference information, and transmits the RRC related parameters to the UE through the RRC reconfiguration message in S650. If the BS attempts to perform RRC-related parameter reconfiguration on the basis of the terminal preference information transmitted from the terminal to the base station in step S640, if the base station is beyond the range of the RRC-related parameters reconfigurable to the base station, The base station may not be able to perform RRC-related parameter reconfiguration with a desired value of the UE. At this time, the BS may not perform the RRC related parameter reconfiguration and may not transmit the RRC reconfiguration message including the RRC related parameters to the UE.

Meanwhile, the MTI value may be included in the RRC connection reconfiguration message in steps S620 and S640 and may be transmitted (and retransmitted) to the mobile station. In this case, the MTI value may not be transmitted in step S600.

As described above, the terminal transmits the terminal preference information to the base station, and the base station reconfigures the RRC-related parameters based on the terminal preference information and transmits the reconfigured parameters to the terminal, so that the terminal can perform an operation according to its preference. The terminal preference information may be transmitted not only by an upper layer signaling such as an RRC message but also by a lower layer signaling such as a MAC layer or a physical layer. For example, the terminal preference information may be transmitted through an RRC connection establishment process The operation to be carried out through the link may be specifically performed as follows.

7 is a flowchart showing an example of an operation in which terminal preference information is transmitted through an RRC connection establishment process.

Referring to FIG. 7, the MS transmits an RRC connection request message to the BS in step S700. The RRC connection request message is a message for requesting the base station to proceed to the connection establishment process for the RRC connection establishment process.

The base station transmits an RRC connection setup message to the terminal (S710). The RRC connection setup message may include preference support information or UE preference info available. The preference support information is information indicating whether or not the base station can receive or use the terminal preference information. Alternatively, the preference support information may indicate whether the base station permits or instructs the terminal to transmit the terminal preference information to the base station. The specific function and contents of the preference support information include the description of S520. For example, as described in S520, the preference support information may be transmitted to the UE through a dedicated control channel (DCCH), which is a logical channel. In other words, the RRC connection setup message including the preference support information may be transmitted to the UE through a dedicated control channel (DCCH).

The MS transmits an RRC connection setup complete message to the BS (S720). In this case, the UE preference information may be included in the RRC connection setup complete message and transmitted to the base station. The specific function and contents of the UE preference information include the description of S200, S410, S530, S610, and S640.

For example, the terminal preference information may include a preference of the terminal, that is, a preferred operation state of the terminal is a default state, a low power consumption state, a transmission efficiency state, a traffic adaptive state , And the terminal may transmit the terminal preference information to the base station so that the base station can configure parameters of the radio resource control (RRC) layer in consideration of the preference of the terminal. In this case, the terminal preference information can be regarded as a kind of assistant information transmitted from the terminal to the base station.

The base station reconfigures RRC-related parameters (e.g., DRX-related parameters) based on the terminal preference information. Modification or reconfiguration of RRC-related parameters includes radio resource configuration or radio resource reconfiguration.

For example, when the terminal indicates to the base station that the terminal's preference is a default state through the terminal preference information, the base station determines that the terminal has no particular preference, and based on the information that the base station can determine, Reconfigure the resource control (RRC) related parameters. Or reconfigures the RRC-related parameters with the radio resource (RRC) -related parameters that the base station has assigned at the time of the first RRC connection. For example, when receiving the terminal preference information indicating the basic state, the base station confirms that the terminal desires to return to the initial radio resource configuration value configured through the existing RRC connection establishment procedure, and transmits the RRC Related parameters can be reconstructed. Of course, the name and function of the state of the terminal indicated by the terminal preference information are exemplified, and in addition, when the terminal's preference information indicates the basic state, the wireless resource configuration It may be possible to set the RRC-related parameter reconfiguration between the UE and the base station so that the base station recognizes it. At this time, the basic state may be a state of requesting a setting opposite to the battery power saving state. For example, if the battery power saving state is a state of requesting a radio resource setting considering battery power saving, the basic state may be a state of requesting a radio resource setting that further allows battery consumption.

As another example, when the terminal indicates to the base station that the terminal's preference is in a low power consumption state through the terminal preference information, the base station can minimize battery consumption or battery consumption based on the terminal preference information Reconfigure the RRC-related parameters.

As another example, when the terminal indicates to the base station that the terminal's preference is a transmission-efficient state through the terminal preference information, the base station may maximize the transmission (or reception) efficiency of the terminal based on the terminal preference information Reconfigure the RRC-related parameters.

As another example, when the terminal indicates to the base station that the terminal's preference is a traffic adaptive state through the terminal preference information, the base station reconfigures the RRC-related parameters so that the terminal can consider the traffic situation based on the terminal preference information do.

In addition, the preferred operation state of the terminal indicated by the terminal preference information may be up or down (for example, power or transmission speed) of a specific item down. For example, when the terminal indicates to the base station that the preference of the terminal is upward of the power item through the terminal preference information, the base station increases the performance of the terminal while allowing more battery consumption of the terminal based on the terminal preference information Reconfigure the RRC-related parameters so that In another example, when the terminal indicates to the base station that the terminal's preference is downward through the terminal preference information, the base station reconfigures the RRC-related parameters so that the terminal can further reduce battery consumption based on the terminal preference information. As another example, when the terminal indicates to the base station that the preference of the terminal is upward of the transmission rate item through the terminal preference information, the base station transmits the RRC related information to the terminal so that the terminal can increase the transmission (or reception) Reconfigure the parameters. As another example, when the terminal indicates to the base station that the preference of the terminal is downward of the transmission rate item through the terminal preference information, the base station transmits the RRC related information Reconfigure the parameters.

In step S720, the UE may transmit the RRC connection setup completion message including the UE preference information in step 720 only if the preference support information (UE preference information available) is included in the RRC connection setup message in step S710. That is, in this case, if affinity support information is not included in the RRC connection setup message in step S710, the terminal transmits an RRC connection setup complete message not including the terminal preference information to the base station in step S720.

Generally, the low power consumption state and the transmission efficient state indicated by the terminal preference information of the UE can be implemented in directions opposite to each other in reconstructing the actual RRC related parameters. For example, the base station reconfigures the parameters for a DRX reconfiguration with a larger DRX cycle interval in a battery power save state, while a transmission efficiency condition includes an RRC related parameter including a DRX related parameter, such as reconfiguring a parameter with a smaller DRX cycle interval In the reconstruction, parameter reconstruction can be performed in the opposite direction. On the other hand, if the transmission efficiency state is not set separately, the default state may be used instead of the transmission efficiency state. At this time, the default state can be treated as in the case of the transmission efficiency state described above.

The BS transmits an RRC reconfiguration message (RRC resource reconfiguration message) including the reconfigured RRC-related parameters based on the terminal preference information received from the MS to the MS in step S730. The UE can perform RRC-related parameter configuration or reconfiguration at the UE based on the reconfigured RRC-related parameters included in the RRC reconnection message received from the Node B.

In step S710, the UE may initially perform a radio resource configuration based on the RRC connection setup message and may be referred to as a default or initial radio resource configuration have. Accordingly, in transmitting the terminal preference information to the base station in step S720, the terminal determines a preferred operating state of the relative terminal based on the basic or initial radio resource configuration value, and generates terminal preference information based on the determined operational state It may be transmitted to the base station.

For example, the UE determines that the UE is in a low power consumption state requiring more battery power saving (or preferred) based on the basic or initial radio resource configuration value, Terminal preference information can be generated and transmitted to the base station. Alternatively, the UE may determine that the UE is in a transmission-efficient state requiring (or preferred) a higher transmission efficiency based on the basic or initial radio resource configuration value, and the terminal preference Information can be generated and transmitted to the base station. As described above, the transmission efficiency state may be configured in a direction opposite to the battery power saving state in the reconfiguration of the DRX parameter or the like in actual implementation. Therefore, the transmission efficiency state may be determined as a case where the terminal is allowed to consume battery power or is in a high power consumption state. After completing S730, the terminal may generate terminal preference information for updating the terminal preference information and transmit the terminal preference information to the base station. In this case, the MS receives the RRC connection reconfiguration message in step S730, determines the preferred operating state of the UE based on the radio resource configuration or the reconfiguration value configured in the UE, generates terminal preference information based on the determined operation state, Lt; / RTI &gt;

8 is a flowchart illustrating another example of an operation in which terminal preference information is transmitted through an RRC connection establishment process.

Referring to FIG. 8, the MS transmits an RRC connection request message to the BS (S800). The RRC connection request message is a message for requesting the base station to proceed to the connection establishment process for the RRC connection establishment process.

The base station transmits an RRC connection setup message to the terminal (S810). The RRC connection setup message may or may not include preference support information (UE preference info available). The preference support information is information indicating whether or not the base station can receive or use the terminal preference information. Alternatively, the preference support information may indicate whether the base station permits or instructs the terminal to transmit the terminal preference information to the base station. The specific function and contents of the preference support information include the description of S520. For example, as described in S520, the preference support information may be transmitted to the UE through a dedicated control channel (DCCH), which is a logical channel. In other words, the RRC connection setup message including the preference support information may be transmitted to the UE through a dedicated control channel (DCCH).

The MS transmits an RRC connection setup complete message to the BS (S820). In this case, the UE preference information may be included in the RRC connection setup complete message and transmitted to the base station. The specific function and contents of the UE preference information include descriptions of S200, S410, S530, S610, and S640.

For example, the terminal preference information may include a preference of a terminal, which is a default state, a low power consumption state, a transmission efficiency state, a traffic adaptive state, And the terminal can transmit the terminal preference information to the base station so that the base station can configure parameters of the radio resource control (RRC) layer in consideration of the preference of the terminal. In this case, the terminal preference information can be regarded as a kind of assistant information transmitted from the terminal to the base station.

The base station reconfigures RRC-related parameters (e.g., DRX-related parameters) based on the terminal preference information. Modification or reconfiguration of RRC-related parameters includes radio resource configuration or radio resource reconfiguration.

For example, when the terminal indicates to the base station that the terminal's preference is default through the terminal preference information, the base station determines that the terminal does not have a particular preference, and based on the information that can be determined by the existing base station, Reconfigure the relevant parameters. Or reconfigures the RRC-related parameters with the radio resource (RRC) -related parameters that the base station has assigned at the time of the first RRC connection. For example, when receiving the terminal preference information indicating the basic state, the base station confirms that the terminal desires to return to the initial radio resource configuration value configured through the existing RRC connection establishment procedure, and transmits the RRC Related parameters can be reconstructed. Of course, the name and function of the operating state preferred by the terminal represented by the terminal preference information may be set differently according to an appointment between the terminal and the base station. Other examples to be described later are also the same.

As another example, when the terminal indicates to the base station that the terminal's preference is in a low power consumption state through the terminal preference information, the base station can minimize battery consumption or battery consumption based on the terminal preference information Reconfigure the RRC-related parameters.

As another example, when the terminal indicates to the base station that the terminal's preference is a transmission-efficient state through the terminal preference information, the base station may maximize the transmission (or reception) efficiency of the terminal based on the terminal preference information Reconfigure the RRC-related parameters.

As another example, when the terminal indicates to the base station that the terminal's preference is a traffic adaptive state through the terminal preference information, the base station reconfigures the RRC-related parameters so that the terminal can consider the traffic situation based on the terminal preference information do.

In addition, the preferred operation state of the terminal indicated by the terminal preference information may be up or down (for example, power or transmission speed) of a specific item down. For example, when the terminal indicates to the base station that the preference of the terminal is upward of the power item through the terminal preference information, the base station increases the performance of the terminal while allowing more battery consumption of the terminal based on the terminal preference information Reconfigure the RRC-related parameters so that In another example, when the terminal indicates to the base station that the terminal's preference is downward through the terminal preference information, the base station reconfigures the RRC-related parameters so that the terminal can further reduce battery consumption based on the terminal preference information. As another example, when the terminal indicates to the base station that the preference of the terminal is upward of the transmission rate item through the terminal preference information, the base station transmits the RRC related information to the terminal so that the terminal can increase the transmission (or reception) Reconfigure the parameters. As another example, when the terminal indicates to the base station that the preference of the terminal is downward of the transmission rate item through the terminal preference information, the base station transmits the RRC related information Reconfigure the parameters.

Meanwhile, regardless of whether the RRC connection setup message includes the preference information preference support information or UE preference info available in step S810, the UE includes the UE preference information in the RRC connection setup complete message in step S820 Lt; / RTI &gt; That is, in this case, even if preference support information is not included in the RRC connection setup message in step S810, the terminal transmits an RRC connection setup complete message including the terminal preference information to the base station in step S810.

Generally, the low power consumption state and the transmission efficient state indicated by the terminal preference information of the UE can be implemented in directions opposite to each other in reconstructing the actual RRC related parameters. For example, a base station reconfigures a parameter with a larger DRX cycle interval in a battery power saving state for a DRX configuration, while an RRC-related parameter including a DRX-related parameter, such as reconfiguring a parameter with a smaller DRX cycle interval, In the reconstruction, parameter reconstruction can be performed in the opposite direction. On the other hand, if the transmission efficiency state is not set separately, the default state may be used instead of the transmission efficiency state.

The base station transmits an RRC resource reconfiguration message including the reconfigured RRC related parameters to the UE (S830). The UE can perform RRC-related parameter configuration or reconfiguration at the UE based on the reconfigured RRC-related parameters included in the RRC reconnection message received from the Node B.

9 is a flowchart illustrating another example of an operation in which terminal preference information is transmitted through an RRC connection establishment process.

Referring to FIG. 9, the MS transmits an RRC connection request message to the BS (S900). The RRC connection request message is a message for requesting the base station to proceed to the connection establishment process for the RRC connection establishment process. In this case, the UE preference information may be included in the RRC connection request message and transmitted to the base station. The specific function and contents of the UE preference information include descriptions of S200, S410, S530, S610, and S640.

For example, the terminal preference information may include a preference of a terminal, which is a default state, a low power consumption state, a transmission efficiency state, a traffic adaptive state, And the terminal can transmit the terminal preference information to the base station so that the base station can configure parameters of the radio resource control (RRC) layer in consideration of the preference of the terminal. In this case, the terminal preference information can be regarded as a kind of assistant information transmitted from the terminal to the base station.

The base station reconfigures RRC-related parameters (e.g., DRX-related parameters) based on the terminal preference information. Modification or reconfiguration of RRC-related parameters includes radio resource configuration or radio resource reconfiguration.

For example, when the terminal indicates to the base station that the terminal's preference is default through the terminal preference information, the base station determines that the terminal does not have a particular preference, and based on the information that can be determined by the existing base station Reconfigure the RRC-related parameters. Or reconfigures the RRC-related parameters with the radio resource (RRC) -related parameters that the base station has assigned at the time of the first RRC connection. For example, when receiving the terminal preference information indicating the basic state, the base station confirms that the terminal desires to return to the initial radio resource configuration value configured through the existing RRC connection establishment procedure, and transmits the RRC Related parameters can be reconstructed. Of course, the name and function of the operating state preferred by the terminal represented by the terminal preference information may be set differently according to an appointment between the terminal and the base station. Other examples to be described later are also the same.

As another example, when the terminal indicates to the base station that the terminal's preference is in a low power consumption state through the terminal preference information, the base station can minimize battery consumption or battery consumption based on the terminal preference information Reconfigure the RRC-related parameters.

As another example, when the terminal indicates to the base station that the terminal's preference is a transmission-efficient state through the terminal preference information, the base station may maximize the transmission (or reception) efficiency of the terminal based on the terminal preference information Reconfigure the RRC-related parameters.

As another example, when the terminal indicates to the base station that the terminal's preference is a traffic adaptive state through the terminal preference information, the base station reconfigures the RRC-related parameters so that the terminal can consider the traffic situation based on the terminal preference information do.

In addition, the preferred operation state of the terminal indicated by the terminal preference information may be up or down (for example, power or transmission speed) of a specific item down. For example, when the terminal indicates to the base station that the preference of the terminal is upward of the power item through the terminal preference information, the base station increases the performance of the terminal while allowing more battery consumption of the terminal based on the terminal preference information Reconfigure the RRC-related parameters so that In another example, when the terminal indicates to the base station that the terminal's preference is downward through the terminal preference information, the base station reconfigures the RRC-related parameters so that the terminal can further reduce battery consumption based on the terminal preference information. As another example, when the terminal indicates to the base station that the preference of the terminal is upward of the transmission rate item through the terminal preference information, the base station transmits the RRC related information to the terminal so that the terminal can increase the transmission (or reception) Reconfigure the parameters. As another example, when the terminal indicates to the base station that the preference of the terminal is downward of the transmission rate item through the terminal preference information, the base station transmits the RRC related information Reconfigure the parameters.

The base station transmits an RRC connection setup message to the UE (S910).

The MS transmits an RRC connection setup complete message to the BS (S920).

The base station transmits an RRC resource reconfiguration message (RRC resource reconfiguration message) including the reconfigured RRC-related parameters to the terminal (S930). The UE can perform RRC-related parameter configuration or reconfiguration at the UE based on the reconfigured RRC-related parameters included in the RRC reconnection message received from the Node B.

10 is an operation flowchart of a terminal supporting preference of a terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 10, the terminal generates terminal preference information (S1000). The terminal can generate the terminal preference information indicating the operation state preferred by the terminal among the operation states of various terminals. For example, the terminal may generate the terminal preference information indicating a state of one of a default state, a low power consumption state, a transmission efficient state, and a traffic adaptive state . Alternatively, the terminal can generate the terminal preference information including the level or the level, as well as the type of the operation state preferred by the terminal. Alternatively, the terminal may generate the terminal preference information indicating up or down of a specific item (e.g., power, transmission rate, etc.) related to the operation of the terminal in preparation for the current radio resource configuration of the terminal .

In addition, the terminal can directly indicate a preferred operation state of the terminal among the various operation states, or can generate the terminal preference information that toggles the terminal's preferred operation state from one state to another. For example, the terminal may directly indicate the state of one of the default state, the low power consumption state, the transmission efficient state, and the traffic adaptive state And may generate the terminal preference information or toggle the terminal's preferred operating state from any of the plurality of states to another state (e.g., from the battery saving state to the transmission efficiency state) The terminal preference information may be generated.

The terminal transmits the terminal preference information to the base station (S1010). The UE preference information may be transmitted not only by an upper layer signaling such as an RRC message but also by a lower layer signaling such as a MAC layer or a physical layer.

The MS receives an RRC connection reconfiguration message from the BS (S1020). The RRC connection reconfiguration message includes an RRC-related parameter (e.g., DRX-related parameter) reconfigured based on the UE preference information. If DRX-related parameters are included in the RRC connection reconfiguration message, the RRC connection reconfiguration message may include the syntax shown in Table 1 above.

The UE changes or reconfigures RRC-related parameters at the UE based on the reconfigured RRC-related parameters. This may be referred to as a radio resource configuration or a radio resource reconfiguration.

Meanwhile, the terminal may receive preference support information (UE preference info available) from the base station before S1000 or S1010. The preference support information is information indicating whether or not the base station can receive or use the terminal preference information. This is because the BS may or may not perform the RRC-related parameter reconfiguration using the terminal preference information according to the performance thereof. The terminal can determine whether to check (or generate or transmit to the base station) its own preference information according to whether the base station can use the terminal preference information. In other words, the terminal may use the preference support information as a criterion for determining whether to use the terminal preference information. That is, the preference support information may indicate whether the terminal permits or instructs the terminal to transmit the terminal preference information to the base station. The specific function and contents of the preference support information include the description of S400 and S520. In addition, the terminal may dedicately receive support of the other assistance information together with the preference support information. For example, the base station may receive not only the preference support information but also various information that the terminal can transmit, for example, auxiliary information for coexistence interference avoidance (IDC) in the device, auxiliary information related to heterogeneous networks, or MBMS- It may be necessary to inform the terminal whether or not it is possible. That is, since the UE may transmit various report information to the BS, there is a need for the BS to explicitly inform the UE whether or not it is supported.

In addition, the UE can receive the UE Preference inquiry or the UE Preference Capability Request from the BS before S1000 or S1010. The terminal preference inquiry information is information that the base station inquires of the terminal whether the terminal can transmit the terminal preference information. At this time, the BS may inquire about the overall information on the overall performance of the UE as well as inquire as to whether the UE supports the transmission of the UE preference information. The UE may transmit UE Preference Capability information indicating whether the UE can transmit (support or create) the UE preference information according to the UE preference inquiry information received from the BS. The UE and the BS can use the UE capability inquiry procedure for exchanging the terminal capability preference inquiry information and the terminal preference performance information. In this case, the terminal preference inquiry information may be included in the UE capability inquiry message (UECapabilityEquiry Message). And, the terminal preference performance information may be transmitted in the terminal capability information (UECapabilityInformation). Specifically, the terminal capability information may be configured as shown in Tables 7 and 8, or Tables 7 and 9.

11 is an operation flowchart of a base station supporting preference of a terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 11, the base station receives terminal preference information from the terminal (S1100). The terminal preference information may indicate a preferred operation state of the terminal among various operation states of the terminal. For example, the terminal preference information may indicate one of a default state, a low power consumption state, a transmission efficient state, and a traffic adaptive state. Alternatively, the terminal preference information may include a step or a level as well as a type of a preferred operation state of the terminal. Alternatively, the terminal preference information may indicate up or down of a specific item (e.g., power, transmission rate, etc.) related to the operation of the terminal in preparation for the current radio resource configuration of the terminal.

The UE preference information may be transmitted not only by an upper layer signaling such as an RRC message but also by a lower layer signaling such as a MAC layer or a physical layer.

The base station changes or reconfigures RRC-related parameters (e.g., DRX-related parameters) based on the terminal preference information (S1110). Modification or reconfiguration of RRC-related parameters includes radio resource configuration or radio resource reconfiguration.

As an example, when the base station receives the terminal preference information for the basic state, the base station can maintain the previously configured RRC related parameters without changing or reconfiguring.

As another example, if the received terminal preference information indicates the battery power saving state, the base station performs RRC-related parameter reconfiguration in a direction that can reduce battery consumption of the terminal.

For example, the base station may reconfigure or reconfigure DRX to operate in a long DRX mode when receiving the terminal preference information for the battery power save state. Or reconfigure DRX so that the terminal's non-active time is kept longer.

As another example, if the received terminal preference information indicates the transmission efficiency state, the base station performs the RRC-related parameter reconfiguration in a direction to increase the transmission efficiency. For example, when the BS receives the UE preference information for the transmission efficiency state, the BS may configure the DRX cycle to be shorter in order to increase the DL transmission efficiency, The non-active time may be made shorter.

As another example, if the received terminal preference information indicates the traffic adaptation state, the base station performs the RRC-related parameter reconfiguration in consideration of an application and / or a traffic situation currently used by the terminal. When the base station receives the terminal preference information indicating the traffic adaptation state from the terminal, the base station confirms that the terminal is in the traffic adaptation state, and determines whether the application currently used by the terminal, the traffic state of the terminal, (E.g., QCI (Quality of Service Identifier), etc.) assigned to the radio resource configuration (e.g., the radio resource configuration) have. Alternatively, the base station may transmit a plurality of available radio resource configurations to the terminal, and the terminal may select a desired configuration within the radio resource configuration transmitted by the base station. Alternatively, the terminal may add information on an allowable delay level or the like to the terminal preference information including information on the traffic adaptation state, or may separately transmit the information to the base station. In this case, the base station confirms that the UE is in the traffic adaptation state based on the UE preference information, and performs radio resource reconfiguration based on the allowable delay level information. In other words, the BS can perform DRX configuration, QoS level configuration (or QCI configuration), scheduling timing, or the like in consideration of an allowable delay time and the like, and transmit the configuration to the UE.

The base station transmits an RRC connection reconfiguration message including the reconfigured RRC related parameters to the terminal (S1120). For example, if a DRX-related parameter is included in the RRC connection reconfiguration message, the RRC connection reconfiguration message may include the syntax shown in Table 1 above.

Meanwhile, the base station may transmit preference support information (or UE preference info available) to the UE before S1100 or S1110. The preference support information is information indicating whether or not the base station can receive or use the terminal preference information. This is because the BS may or may not perform the RRC-related parameter reconfiguration using the terminal preference information according to the performance thereof. The terminal can determine whether to check (or generate or transmit to the base station) its own preference information according to whether the base station can use the terminal preference information. In other words, the terminal may use the preference support information as a criterion for determining whether to use the terminal preference information. That is, the preference support information may indicate whether the terminal permits or instructs the terminal to transmit the terminal preference information to the base station. The specific function and contents of the preference support information include the description of S400 and S520. In addition, the terminal may dedicately receive support of the other assistance information together with the preference support information. For example, the base station may receive not only the preference support information but also various information that the terminal can transmit, for example, auxiliary information for coexistence interference avoidance (IDC) in the device, auxiliary information related to heterogeneous networks, or MBMS- It may be necessary to inform the terminal whether or not it is possible. That is, since the UE may transmit various report information to the BS, there is a need for the BS to explicitly inform the UE whether or not it is supported.

Also, the base station may transmit the UE preference inquiry or UE preference capability request information to the UE before S1100 or S1110. The terminal preference inquiry information is information that the base station inquires of the terminal whether the terminal can transmit the terminal preference information. At this time, the BS may inquire about the overall information on the overall performance of the UE as well as inquire as to whether the UE supports the transmission of the UE preference information. The UE transmits UE Preference Capability information indicating whether the UE can transmit (support or generate) the UE preference information to the Node B according to the UE preference inquiry information received from the Node B, And receives performance information. The UE and the BS can use the UE capability inquiry procedure to exchange the UE preference inquiry information and the UE preference performance information. In this case, the terminal preference inquiry information may be included in the UE capability inquiry message (UECapabilityEquiry Message). And, the terminal preference performance information may be transmitted in the terminal capability information (UECapabilityInformation). Specifically, the terminal capability information may be configured as shown in Tables 7 and 8, or Tables 7 and 9.

12 is a block diagram of a terminal supporting a terminal's preference and a base station according to an exemplary embodiment of the present invention.

Referring to FIG. 12, a terminal 1200 includes a transmitter 1220, a receiver 1205, and a terminal processor 1210. The terminal processor 1210 further includes a message processing unit 1211 and a preference determination unit 1212.

The receiving unit 1205 receives the preference support information, the RRC connection reconfiguration message, the RRC connection setup message, the terminal preference inquiry information, and the like from the base station 1250. The receiving unit 1205 sends the received information or messages to the message processing unit 1211.

The preference determination unit 1212 determines (or selects) a preferred operation state of the terminal 1200. The preference determination unit can determine a preferred operation state of the terminal 1200 among various operation states of the terminal. For example, the preference determining unit 1212 may determine one of a default state, a low power consumption state, a transmission efficient state, and a traffic adaptive state to the terminal 1200 ) Can be determined to be in the preferred operating state. Alternatively, the preference determination unit 1212 may determine not only the type of the operation state that the terminal 1200 desires but also the level or level of the corresponding state. The preference determination unit 1212 instructs the up or down direction of a specific item (e.g., power, transmission rate, etc.) related to the operation of the terminal 1200 in preparation for the current radio resource configuration of the terminal It is possible to determine the state of the terminal 1200 as a preferred operation state.

The preference determination unit 1212 can determine the preferred operating state of the terminal 1200 continuously, periodically, or non-periodically. The preference determining unit 1212 determines whether the terminal 1200 receives the preference support information or the terminal preference inquiry information from the terminal 1200 or the message processing unit 1212, Judgment can be performed. The preference determination unit 1212 determines whether the terminal 1200 receives the preference support information or the terminal preference inquiry information from the terminal 1200, specifically, the reception unit 1205 or the message processing unit 1212, It may initiate a continuous or periodic or aperiodic determination of the condition.

The preference determination unit 1212 transmits the determined operation state of the terminal 1200 to the message processing unit 1211.

The message processing unit 1211 generates terminal preference information based on a preferred operating state of the terminal 1200. [ The message processing unit 1211 may directly indicate a preferred operation state of the terminal 1200 among the operation states of the various terminals or may transmit the terminal preference information which toggles a preferred operation state of the terminal 1200 from one state to another state Lt; / RTI &gt; For example, the message processor 1211 may determine a state of one of the default state, the low power consumption state, the transmission efficient state, and the traffic adaptive state Directly generates the terminal preference information, or the terminal preference information that toggles from one of the plurality of states to another state (for example, from the battery saving state to the transmission efficiency state) .

When the message processor 1211 sends the terminal preference information to the transmitter 1220, the transmitter 1220 transmits the terminal preference information to the BS 1250.

In addition, the message processing unit 1211 analyzes or analyzes the syntax of the information or messages received from the receiving unit 1205. In particular, the message processing unit 1211 may analyze or interpret messages or information in the form of Table 1, Table 3, Table 4, Table 5, Table 6, Table 10, and Table 11. For example, the message processing unit 1211 analyzes the syntax of the affinity support information to determine whether the base station 1250 supports the terminal preference information of the terminal 1200 or can receive the terminal preference information, It is possible to check whether or not the terminal preference information is allowed to be transmitted. Or the message processing unit 1211 analyzes the syntax of the RRC connection reconfiguration message and configures the changed (or reconfigured) RRC related parameters included in the RRC connection reconfiguration message in the terminal 1200. [

The message processor 1211 can perform the instructions indicated by the respective information or messages. For example, when the base station 1250 can support the terminal 1200's preference in light of the preference support information, or when the base station 1250 allows (or commands) the terminal 1200 to transmit terminal preference information, The message processor 1211 sends the terminal preference information to the transmitter 1220 and the transmitter 1220 can transmit the terminal preference information to the base station 1250.

The message processing unit 1211 generates terminal preference performance information indicating that the terminal 1200 supports transmission of assistance information (terminal preference information) about the preferences and transmits the terminal preference performance information to the base station 1250 by the transmission unit 1220 . In addition, the message processing unit 1211 may include assistant information (IDC) for interference avoidance for in-device coexistence (IDC) of the terminal 1200, (Or transmission) information of at least one of the supplementary information related to the heterogeneous network (HetNet) and the MBMS related auxiliary information, and the transmission unit 1220 generates information indicating whether the terminal 1200 can support And transmit it to the base station 1250. In this case, the message processing unit 1211 may generate a message or information of the format shown in Tables 7 to 9. [ The message processing unit 1211 may generate the terminal preference performance information based on the terminal preference inquiry information received by the receiving unit 1205. [

Meanwhile, the receiving unit 1205 may receive from the BS 1250 a minimum time interval during which the transmitting unit 1220 should wait for transmission of the terminal preference information or a minimum time interval (MTI) representing the transmission period of the terminal's preference information . The MTI may be included in the preference support information or the RRC connection reconfiguration message and may be transmitted from the base station. The message processor 1211 may control a time interval for transmitting the terminal preference information from the transmitter 1220 based on the MTI.

The base station 1250 includes a receiving unit 1260, a base station processor 1270, and a transmitting unit 1255. The base station processor 1270 includes a message processing unit 1271 and a parameter changing unit 1272.

The transmission unit 1255 transmits the preference support information, the RRC connection reconfiguration message, the RRC connection setup message, the terminal preference inquiry information, and the like to the terminal 1200.

The receiving unit 1260 receives the terminal preference information, the RRC connection request message, the RRC connection setup message, the terminal preference inquiry information, and the like from the terminal 1200 and delivers the received information to the message processing unit 1271. The terminal preference information may indicate a preferred operation state of the terminal 1200 among the operational states of the various terminals 1200. For example, the terminal preference information may indicate one of a default state, a low power consumption state, a transmission efficient state, and a traffic adaptive state. Alternatively, the terminal preference information may indicate not only the type of operation state preferred by the terminal 1200, but also a step or a level. Or the terminal preference information may be used to up or down a specific item (e.g., power, transmission rate, etc.) related to the operation of the terminal 1200 in preparation for the current radio resource configuration of the terminal 1200 It can indicate the indicating state.

The message processing unit 1271 analyzes or analyzes the information or the syntax of the message received from the receiving unit 1260. In particular, the message processing unit 1271 can analyze or interpret the terminal preference information and messages or information in the formats shown in Tables 7 to 9.

The parameter changing unit 1272 reconfigures the radio resource control related parameters based on the terminal preference information. The parameter changing unit 1272 may change the parameter according to one of the preferred operating states of the terminal represented by the terminal preference information, for example, the basic state, the battery saving state, the transmission efficiency state, The radio resource control (RRC) related parameters can be changed or reconfigured. As another example, the parameter changing unit 1272 may change or reconfigure the RRC-related parameters by reflecting the level or level as well as the type of the operation state that the terminal 1200 desires. As another example, the parameter changing unit 1272 may change up or down the specific item (e.g., power, transmission rate) related to the operation of the terminal 1200 in preparation for the current radio resource configuration of the terminal 1200 the RRC-related parameter may be changed or reconfigured on the basis of a state indicating down (down).

Modification or reconfiguration of RRC-related parameters includes radio resource configuration or radio resource reconfiguration.

As an example, when the terminal preference information indicates the basic state, the parameter changing unit 1272 can maintain the existing RRC-related parameters without changing or reconfiguring the terminal.

As another example, if the terminal preference information indicates the battery power saving state, the parameter changing unit 1272 performs RRC-related parameter reconfiguration in a direction that can reduce battery consumption of the terminal. Specifically, for example, the parameter changing unit 1272 reconfigures DRX such that the terminal configures or reconfigures the DRX to operate in the long DRX mode, or the inactivity time in which the terminal does not monitor the PDCCH subframe is maintained longer .

As another example, if the terminal preference information indicates the transmission efficiency state, the parameter changing unit 1272 performs the RRC-related parameter reconfiguration in a direction that can increase the transmission efficiency. Specifically, for example, the parameter changing unit 1272 may reconfigure the DRX so that the length of the DRX cycle is shorter or the inactivity time of the terminal is shorter in order to increase the downlink transmission efficiency.

As another example, when the terminal preference information indicates the traffic adaptation state, the parameter changing unit 1272 performs the RRC-related parameter reconfiguration in consideration of the application and / or traffic conditions currently used by the terminal 1200 . In this case, the parameter change unit 1272 changes the radio resource configuration (QoS) based on the application currently used by the UE, the traffic condition of the UE, and the QoS level (e.g., QCI) And transmits the selected radio resource configuration to the message processor 1271. Or the parameter changing unit 1272 may transmit a plurality of available radio resource configurations to the message processing unit 1271. [ In other words, when the terminal preference information indicates the traffic adaptation state, the parameter changing unit 1272 changes the DRX configuration, the QoS level configuration (or the QCI configuration), or the scheduling scheduling timing, and so on.

The parameter changing unit 1272 transfers the changed or reconfigured RRC related parameter to the message processing unit 1271. [ The message processor 1271 generates an RRC connection reconfiguration message including the reconfigured RRC-related parameters.

The parameter changing unit 1272 sends an RRC connection reconfiguration message to the transmission unit 1255. [ The transmission unit 1255 transmits the RRC connection reconfiguration message to the terminal 1200. For example, if DRX-related parameters are included in the RRC connection reconfiguration message, the RRC connection reconfiguration message may include the syntax shown in Table 1 above.

The message processor 1271 generates preference support information indicating whether or not the base station 1250 can support (or receive) the supplementary information on the preference of the terminal 1200 (i.e., the terminal preference information) And the transmission unit 1255 can transmit it to the terminal 1200. The message processing unit 1271 may include assistant information for interference avoidance for in-device coexistence (IDC) of the terminal 1200, as well as supplementary information on the preference of the terminal 1200. [ , Auxiliary information related to a heterogeneous network (HetNet), and MBMS-related auxiliary information to the base station 1250. The base station 1250 can generate information indicating whether the base station 1250 can support (or receive) In this case, the transmitting unit 1255 can transmit the same to the terminal 1200. In this case, the message processing unit 1271 may generate the preference support information including the syntax shown in Table 3, Table 4, Table 5, or Table 6. [

Meanwhile, the message processing unit 1271 generates terminal preference inquiry information, which is information that the base station 1250 inquires of the terminal 1200 about whether the terminal 1200 can transmit (or support) the terminal preference information, The terminal 1255 can transmit it to the terminal 1200. The message processing unit 1271 determines whether the terminal 1200 can transmit (or support) the terminal preference information based on the terminal preference performance information generated and transmitted by the terminal 1200 according to the terminal preference inquiry information .

Meanwhile, the transmitter 1255 may transmit the minimum time interval during which the terminal 1200 waits between transmissions of the terminal preference information or a minimum time interval (MTI) indicating the transmission period of the terminal preference information to the terminal 1200 . In this case, the MTI can be transmitted to the terminal 1200 through the preference support information or the RRC connection reconfiguration message. Specifically, the MTI is changed by the parameter changing unit 1272, and is transmitted to the terminal 1200 through the transmitting unit 1255 by the message processing unit 1271 and included in the preference support information or the RRC connection reconfiguration message .

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (20)

A method of supporting a preference of a terminal performed by a terminal,
Generating terminal preference information indicating a preferred operating state of the terminal and transmitting the terminal preference information to a base station;
Receiving, from the base station, an RRC connection reconfiguration message including a reconfiguration parameter related to discontinuous reception (DRX) based on the terminal preference information; And
And configuring the DRX-related parameters in the terminal,
The terminal preference information represents a state of a default state, a low power consumption state, a transmission efficient state, and a traffic adaptive state,
When the terminal preference information indicates the basic state, the RRC related parameter is maintained or the RRC related parameter is reconfigured with the RRC related parameter allocated at the initial RRC connection,
When the terminal preference information indicates the battery power saving state, the DRX is configured or reconfigured to allow the terminal to operate in the long term DRX mode,
If the terminal preference information indicates the transmission efficiency status, the short term DRX is configured or reconfigured,
Wherein if the terminal preference information indicates the transmission efficiency state, the radio resource is configured or reconfigured based on the allowable delay level information. delete The method according to claim 1,
Further comprising receiving preference support information from the base station, the preference support information indicating that the base station supports or permits the terminal preference information. The method according to claim 1,
Receiving UE preference inquiry information from the BS indicating whether the UE supports transmission of the UE preference information; And
Further comprising generating UE Preference Capability information indicating that the UE supports transmission of the UE preference information based on the UE preference inquiry information and transmitting the generated UE Preference Capability information to the base station Way. The method according to claim 1,
Further comprising the step of receiving, from the base station, a minimum time required for the terminal to wait until transmission of new terminal preference information after transmission of the terminal preference information, or a minimum time interval (MTI) indicating a transmission period of the terminal preference information, ,
Wherein the terminal preference information is transmitted to the base station based on the MTI. delete delete delete delete delete A terminal supporting the terminal's preference,
A preference determining unit for determining a preferred operating state of the terminal;
A message processor for generating terminal preference information indicating a preferred operating state of the terminal;
A transmitting unit for transmitting the generated terminal preference information to a base station;
A receiving unit for receiving an RRC connection reconfiguration message including parameters reconfigured based on the terminal preference information for discontinuous reception (DRX) related parameters; And
And a message processor for configuring or reconfiguring the DRX-related parameters to the terminal,
The preference determining unit may determine,
Based on the terminal preference information, a state of one of a default state, a low power consumption state, a transmission efficient state, and a traffic adaptive state, , &Lt; / RTI &
When the terminal preference information indicates the basic state, the RRC related parameter is maintained or the RRC related parameter is reconfigured with the RRC related parameter allocated at the initial RRC connection,
When the terminal preference information indicates the battery power saving state, the DRX is configured or reconfigured to allow the terminal to operate in the long term DRX mode,
If the terminal preference information indicates the transmission efficiency status, the short term DRX is configured or reconfigured,
Wherein the radio resource is configured or reconfigured based on allowable delay level information when the terminal preference information indicates the transmission efficiency state. delete 12. The method of claim 11,
Wherein the receiving unit receives preference support information from the base station indicating that the base station supports or permits the terminal preference information. 12. The method of claim 11,
Wherein the receiver receives UE Preference inquiry information from the BS indicating whether the UE supports transmission of the UE preference information,
Wherein the message processor generates UE Preference Capability information indicating that the UE supports transmission of the UE preference information based on the preference inquiry information,
Wherein the transmitting unit transmits the UE Preference Capability information to the BS. 12. The method of claim 11,
Wherein the receiver receives from the BS a minimum time to wait for transmission of new terminal preference information after transmission of the terminal preference information or a minimum time interval (MTI) representing a transmission period of the terminal preference information,
Wherein the message processing unit controls the transmitting unit to transmit the terminal preference information to the base station based on the MTI. delete delete delete delete delete

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